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Silver metal tap with spiral flutes and square shank

Greenfield Threading

Greenfield Threading 326539 Straight Flute Hand Tap 3/8-16 UNC Bottoming 3 Flutes

SKU CH-R8VE-QM2SK

Straight-flute hand tap cuts 3/8-16 UNC internal threads to a 1.25 in depth in a 2.94 in overall length

  • Cuts full threads to depth with bottoming design
  • 3/8-16 UNC size fits standard coarse threads
  • High-speed steel with TiN coating resists wear
  • 3 flutes clear chips efficiently during hand tapping
  • 94 in overall length suits general workshop use

Greenfield Threading 326539 Hand Tap

This straight flute hand tap cuts 3/8-16 UNC internal threads in a single pass. It is designed for machinists and maintenance technicians who need precise thread restoration or creation in through holes and blind holes. The H3 thread limit and 2B class of fit deliver consistent results in general-purpose applications.

TiN coated high speed steel construction

The titanium nitride coating reduces friction and extends tool life when cutting steel, stainless steel, and non-ferrous alloys. A 75 percent thread drill size of 5/16 in prepares the hole for optimal engagement. Right hand cutting action matches standard threading operations across workshop and field repairs.

2.94 in overall length with 1.25 in thread length

The compact profile reaches confined work areas while providing full thread depth for 3/8 in fasteners. Three flutes balance chip clearance and cutting stability in medium hardness materials. Not suited for high volume production tapping or exotic alloys requiring specialised geometry.

How it compares

Measured against everything we stock in Bits, Hole Saws & Accessory Kits, at today’s prices. Recalculated every night.

Price $9.99
Cheaper than about 88% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCHICAGO-LATROBE

Questions about this item

Will the TiN coating on this 3/8-16 tap wear off and require replacement?

The TiN coating extends tool life but will gradually wear with repeated use; replace the tap when threads no longer meet the 2B class-of-fit tolerance.

What limits continuous threading with this H3-limit bottoming tap?

Chip evacuation in deep holes is the first limit; the 1.25 in thread length and bottoming design restrict how far you can thread without clearing chips.

How much heat builds up when running this high-speed steel tap all day?

High-speed steel generates noticeable heat during prolonged cutting; use cutting fluid and allow cooling intervals to maintain the H3 thread limit and 2B fit.

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